Books in Biology (sorted by popularity)
- Life History of the Kangaroo Rat Charles Taylor Vorhies and Walter P. Taylor 149 downloads
- On the Genesis of Species St. George Jackson Mivart 147 downloads
- Darwin and Modern Science A. C. Seward 145 downloads
- Lamarck, the Founder of Evolution: His Life and Work A. S. Packard 145 downloads
- Birds in Town & Village W. H. Hudson 144 downloads
- The Human Side of Animals Royal Dixon 142 downloads
- Development of the Digestive Canal of the American Alligator A. M. Reese 141 downloads
- "Wee Tim'rous Beasties": Studies of Animal life and Character Douglas English 136 downloads
- The Story of the Living Machine H. W. Conn 133 downloads
- Text Book of Biology, Part 1: Vertebrata H. G. Wells 132 downloads
- On the Reception of the 'Origin of Species' Thomas Henry Huxley 131 downloads
- My Studio Neighbors W. Hamilton Gibson 129 downloads
- De l'origine des espèces (French) Charles Darwin 125 downloads
- Ducks at a Distance: A Waterfowl Identification Guide Bob Hines 120 downloads
- Evolution, Old & New Samuel Butler 120 downloads
- The Origin of Species Thomas Henry Huxley 118 downloads
- Love's Meinie: Three Lectures on Greek and English Birds John Ruskin 115 downloads
- Species and Varieties, Their Origin by Mutation Hugo de Vries 114 downloads
- Darwin, and After Darwin, Volumes 1 and 3 George John Romanes 112 downloads
- A Critical Examination of the Position of Mr. Darwin's Work, "On the Origin of Species," in Relation to the Complete Theory of the Causes of the Phenomena of Organic Nature Thomas Henry Huxley 109 downloads
- Nouveaux souvenirs entomologiques - Livre II (French) Jean-Henri Fabre 104 downloads
- The Evolution of Man Scientifically Disproved in 50 Arguments William A. Williams 102 downloads
- A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation' Francis Bowen 99 downloads
- The Minds and Manners of Wild Animals: A Book of Personal Observations William T. Hornaday 98 downloads
- Nature Near London Richard Jefferies 96 downloads